drivers/dma/ioat.c

   1 /*
   2  * Intel I/OAT DMA Linux driver
   3  * Copyright(c) 2007 - 2009 Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * The full GNU General Public License is included in this distribution in
  19  * the file called "COPYING".
  20  *
  21  */
  22
  23 /*
  24  * This driver supports an Intel I/OAT DMA engine, which does asynchronous
  25  * copy operations.
  26  */
  27
  28 #include <linux/init.h>
  29 #include <linux/module.h>
  30 #include <linux/pci.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/dca.h>
  33 #include "ioatdma.h"
  34 #include "ioatdma_registers.h"
  35 #include "ioatdma_hw.h"
  36
  37 MODULE_VERSION(IOAT_DMA_VERSION);
  38 MODULE_LICENSE("GPL");
  39 MODULE_AUTHOR("Intel Corporation");
  40
  41 static struct pci_device_id ioat_pci_tbl[] = {
  42         /* I/OAT v1 platforms */
  43         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT) },
  44         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB)  },
  45         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) },
  46         { PCI_DEVICE(PCI_VENDOR_ID_UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) },
  47
  48         /* I/OAT v2 platforms */
  49         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB) },
  50
  51         /* I/OAT v3 platforms */
  52         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) },
  53         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) },
  54         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) },
  55         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) },
  56         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) },
  57         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) },
  58         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) },
  59         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) },
  60         { 0, }
  61 };
  62
  63 struct ioat_device {
  64         struct pci_dev          *pdev;
  65         void __iomem            *iobase;
  66         struct ioatdma_device   *dma;
  67         struct dca_provider     *dca;
  68 };
  69
  70 static int __devinit ioat_probe(struct pci_dev *pdev,
  71                                 const struct pci_device_id *id);
  72 static void __devexit ioat_remove(struct pci_dev *pdev);
  73
  74 static int ioat_dca_enabled = 1;
  75 module_param(ioat_dca_enabled, int, 0644);
  76 MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
  77
  78 static struct pci_driver ioat_pci_driver = {
  79         .name           = "ioatdma",
  80         .id_table       = ioat_pci_tbl,
  81         .probe          = ioat_probe,
  82         .remove         = __devexit_p(ioat_remove),
  83 };
  84
  85 static int __devinit ioat_probe(struct pci_dev *pdev,
  86                                 const struct pci_device_id *id)
  87 {
  88         void __iomem *iobase;
  89         struct ioat_device *device;
  90         unsigned long mmio_start, mmio_len;
  91         int err;
  92
  93         err = pci_enable_device(pdev);
  94         if (err)
  95                 goto err_enable_device;
  96
  97         err = pci_request_regions(pdev, ioat_pci_driver.name);
  98         if (err)
  99                 goto err_request_regions;
 100
 101         err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
 102         if (err)
 103                 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 104         if (err)
 105                 goto err_set_dma_mask;
 106
 107         err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
 108         if (err)
 109                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
 110         if (err)
 111                 goto err_set_dma_mask;
 112
 113         mmio_start = pci_resource_start(pdev, 0);
 114         mmio_len = pci_resource_len(pdev, 0);
 115         iobase = ioremap(mmio_start, mmio_len);
 116         if (!iobase) {
 117                 err = -ENOMEM;
 118                 goto err_ioremap;
 119         }
 120
 121         device = kzalloc(sizeof(*device), GFP_KERNEL);
 122         if (!device) {
 123                 err = -ENOMEM;
 124                 goto err_kzalloc;
 125         }
 126         device->pdev = pdev;
 127         pci_set_drvdata(pdev, device);
 128         device->iobase = iobase;
 129
 130         pci_set_master(pdev);
 131
 132         switch (readb(iobase + IOAT_VER_OFFSET)) {
 133         case IOAT_VER_1_2:
 134                 device->dma = ioat_dma_probe(pdev, iobase);
 135                 if (device->dma && ioat_dca_enabled)
 136                         device->dca = ioat_dca_init(pdev, iobase);
 137                 break;
 138         case IOAT_VER_2_0:
 139                 device->dma = ioat_dma_probe(pdev, iobase);
 140                 if (device->dma && ioat_dca_enabled)
 141                         device->dca = ioat2_dca_init(pdev, iobase);
 142                 break;
 143         case IOAT_VER_3_0:
 144                 device->dma = ioat_dma_probe(pdev, iobase);
 145                 if (device->dma && ioat_dca_enabled)
 146                         device->dca = ioat3_dca_init(pdev, iobase);
 147                 break;
 148         default:
 149                 err = -ENODEV;
 150                 break;
 151         }
 152         if (!device->dma)
 153                 err = -ENODEV;
 154
 155         if (err)
 156                 goto err_version;
 157
 158         return 0;
 159
 160 err_version:
 161         kfree(device);
 162 err_kzalloc:
 163         iounmap(iobase);
 164 err_ioremap:
 165 err_set_dma_mask:
 166         pci_release_regions(pdev);
 167         pci_disable_device(pdev);
 168 err_request_regions:
 169 err_enable_device:
 170         return err;
 171 }
 172
 173 static void __devexit ioat_remove(struct pci_dev *pdev)
 174 {
 175         struct ioat_device *device = pci_get_drvdata(pdev);
 176
 177         dev_err(&pdev->dev, "Removing dma and dca services\n");
 178         if (device->dca) {
 179                 unregister_dca_provider(device->dca);
 180                 free_dca_provider(device->dca);
 181                 device->dca = NULL;
 182         }
 183
 184         if (device->dma) {
 185                 ioat_dma_remove(device->dma);
 186                 device->dma = NULL;
 187         }
 188
 189         kfree(device);
 190 }
 191
 192 static int __init ioat_init_module(void)
 193 {
 194         return pci_register_driver(&ioat_pci_driver);
 195 }
 196 module_init(ioat_init_module);
 197
 198 static void __exit ioat_exit_module(void)
 199 {
 200         pci_unregister_driver(&ioat_pci_driver);
 201 }
 202 module_exit(ioat_exit_module);